JP4319537B2 - Piping heater - Google Patents

Description

  The present invention relates to a pipe heater that can be used for heat insulation or heating of arbitrary pipes such as precision instruments and devices. More specifically, the present invention has excellent adhesion to pipes and generates very little dust that can be used in clean rooms. Further, the present invention relates to a piping heater that is easy to install.

As a heater that can be used for heat insulation or heating of a conventional precision instrument or apparatus, for example, a heater-attached pipe formed by contacting a heater along the inner wall surface of the pipe itself (see, for example, Patent Document 1). In addition, a fiberglass tape for heat insulation formed by heat-sealing a thin thermoplastic resin sheet on at least the upper and lower surfaces of a fiberglass tape body formed by collecting glass fibers in a band shape (see, for example, Patent Document 2). It has been known.
JP-A-11-108283 JP 2002-228087 A

  The piping with heater described in the above-mentioned Patent Document 1 needs to be used properly in consideration of the length and branching for each place to be used, especially when the piping shape is special. Therefore, it is necessary to separately prepare the pipe itself, industrial mass production is difficult, and when the inner diameter of the pipe is thin, it is difficult to arrange the heater in the pipe, and the piping work itself is complicated.

  Further, the fiberglass tape for heat insulation described in the above-mentioned Patent Document 2 can be wound and the base material is composed of fiberglass tape, and a thin thermoplastic resin sheet is thermally fused on at least the upper and lower surfaces of the fiberglass tape body. Because it is worn, it can be applied to piping of various shapes, has heat resistance, and is manufactured with the goal of less scattering of glass fibers, but it only has a heat insulation function by heat insulation. , It does not have a function of positively heating and maintaining a predetermined temperature.

  The present invention has an exothermic part layer and a heat insulating part layer, and is excellent in adhesion to piping in a heater used for piping that is wrapped around and used for heat insulation or heating of arbitrary piping such as precision instruments and devices. The present invention provides a piping heater that generates very little dust and that can be easily attached and detached.

  As a result of intensive studies in view of the above-mentioned problems, the present invention forms a heat generating part layer that is wound around a pipe surface and heats it and a heat insulating part layer that surrounds it from the outside. Are joined together at both edge portions in the width direction (hereinafter, the winding direction of each layer portion is referred to as the width direction, and each end is referred to as the edge portion), and the heating surface of the heat generating portion layer is connected to the pipe surface. By making the width of the heat insulating part layer wider than the width of the heat generating part layer when tightly wound on the heat generating part layer, the heating surface of the heat generating part layer is adhered to the entire pipe so that the entire heater does not wrinkle on the heating surface. The present invention has been completed focusing on the fact that piping can be covered.

  That is, the present invention is a pipe heater that has a heat generating part layer and a heat insulating part layer, and is wound around the outer periphery of the pipe to be heated in the width direction to heat and heat the pipe. The heating layers are separated from each other. In the heating layer, the heating element is placed on the surface of the heat-resistant and flexible belt-like substrate, and the whole is covered with a heat-resistant enveloping material. In addition, the heat insulating layer is formed by encapsulating a belt-shaped heat insulating material with a heat resistant enveloping material so that the heat insulating layer is on the non-heating surface side of the heat generating portion layer and on both sides in the width direction. The edges are aligned and overlapped, and the overlapped edges are joined together to form the main body. At that time, the heating surface of the heater heating part layer for piping is wound so as to be in close contact with the surface of the piping The width of the heat insulation layer is such that the inner surface of the heat insulation layer It is set longer enough to reside in a pipe heater according to claim.

  The heater for piping according to the present invention is configured by separating the heat generating portion layer and the heat insulating portion layer, the heat insulating portion layer is arranged on the non-heating surface side of the heat generating portion layer, and both side edges in the width direction are aligned. The body portions are formed by joining the overlapped edge portions together, and the width of both layers is such that the heating surface of the heater heating portion layer for piping is in close contact with the surface of the piping in the width direction. Since the width of the heat insulation layer is set so long that the inner surface of the heat insulation layer is loosely in close contact with the outer peripheral surface of the heat generation portion layer, the heat generation portion is wrapped around the pipe. Even if the layer and the heat insulation layer are thick, the heating surface does not become wrinkled, it adheres well to the outer peripheral surface of the pipe and has good heat conduction, and the heat insulating layer surface adheres closely to the outer peripheral surface of the heat generating layer and is compact. It becomes the appearance of wearing. Moreover, since the heat generating part layer and the heat insulating part layer are each encapsulated by an encapsulating material made of a heat-resistant resin sheet, the generation of dust is extremely small, so that it can be used in a clean room or the like. Furthermore, those equipped with fastening portions are easy to attach and detach to / from the piping, have excellent work efficiency, and have great industrial effects.

  Hereinafter, the heater for piping of the present invention will be described in detail. The heater for piping of the present invention has a heat generating part layer and a heat insulating part layer, and the heat generating part layer and the heat insulating part layer are separately configured. The heat generating layer is formed by disposing a heat generating element on the surface of the belt-shaped substrate having heat resistance and flexibility, which is on the heating surface side, and encapsulating the whole with a heat resistant encapsulating material.

  The heat-resistant and flexible belt-like base material used for the heat-generating part layer is a base material that supports the heat-generating body, preferably from a material having excellent heat insulation in addition to heat resistance and flexibility. Composed. Examples of such materials include flexible continuous sheets composed of inorganic materials such as glass, ceramic, silica, alumina, mullite, fiber woven fabrics or nonwoven fabrics, brackets, mats or PTFE, PFT, FEP, PCTFE, Heat-resistant organic materials such as fluorinated resins such as ETFE, ECTFE, PVdF, aramid resins, polyamide, polyimide, polycarbonate, polyacetal, polybutylene terephthalate, modified polyphenylene ether, polyphenylene sulfide, polysulfone, polyethersulfone, polyarylate, polyetheretherketone Examples include materials, and are appropriately selected and used according to the target heat retention or heating temperature. Among them, woven fabric made of glass fiber is more preferably used because of heat resistance and ease of handling.Moreover, the said material can also be used by mixing as a raw material, or laminating | stacking by layer form.

  Although the dimension of said strip | belt-shaped base material is not specifically limited, Usually, thickness is set to about 0.5-10 mm, and it is about 1-3 mm practically. It can be made thicker or thinner, but if it is too thick, the flexibility is insufficient particularly when the piping is thin. Further, the width of the base material depends on the outer peripheral length of the target pipe, and is specifically set to be slightly narrower than the outer peripheral length. Although it is usually about 10 to 1000 mm, it can be made wider or narrower depending on the thickness of the pipe.

  The length of the strip base material depends on the length of the pipe, but if the pipe is long, the pipe heater is used as a relatively short one that is easy to handle as the length of the pipe heater. It is practical to do this, and the length of one pipe heater can be, for example, about 200 to 1000 mm, and the length of the belt-like substrate is determined accordingly. The actual length is a little shorter than the length of the manufactured pipe heater.

  Further, the heating element is not particularly limited as long as it generates heat using resistance heating, and usually includes linear, ribbon-like, and net-like planar heating elements. The wire can be used practically. The power consumption of the heating element is appropriately set according to the target pipe of the tape heater of the present invention and its heating / heat-retaining temperature, but is usually 10 to 500 watts. Since the pipe heater of the present invention is used so as to be wound around the outer peripheral surface of the pipe in the width direction, it is arranged in the length direction so that there is little bending in the width direction, that is, in principle in the case of a linear heater. preferable.

  From the viewpoint of safety and durability, the outer peripheral portion of the heating element is preferably covered with a heat-resistant and protective material such as an electrically insulating material. The protective material is not particularly limited, and examples thereof include a silica sleeve or cloth, an alumina sleeve or cloth, a glass sleeve or cloth, and the silica sleeve can be used safely.

  The method for supporting the heating element on the belt-shaped substrate is not particularly limited, but glass yarns, silica yarns, alumina yarns, and fine heat-resistant fibers such as those coated with a fluororesin, yarns, etc. A method of winding and sewing an electric heater wire and a belt-like base material portion that fixes the electric heater wire, a method of adhering the electric heater wire portion to the surface of the belt-like substrate with a knitted sheet, a method of sewing the electric heater wire itself with a sewing machine, etc. Is mentioned. In this case, from the viewpoint of thermal efficiency, a method in which the material used for the support does not cover the heating element as much as possible is preferable.

  The surface (heating side surface) of the electric heater wire supported on the belt-like base material on the side where the electric heater wire is supported is coated with a sheet material having excellent thermal conductivity, that is, a sheet-shaped heat-uniforming material. Is preferred. By covering with the sheet-shaped soaking material having excellent thermal conductivity, the heat generated by the heater is more uniformly distributed on the heating side surface of the heater for piping, and the surface of the piping can be heated more uniformly. You may arrange | position so that the whole which supported the said heat generating body by the strip | belt-shaped base material may be encapsulated with said sheet-like soaking material. In addition, a heat insulating material layer can be further provided between the back surface side of the belt-like base material layer or between the soaking material layer and the encapsulating material layer. As a material constituting such a heat insulating material layer, a heat insulating material used for a heat insulating portion described later can be used.

  Although it does not specifically limit as said sheet-shaped soaking material excellent in thermal conductivity, Usually, metal foil, such as copper or aluminum, is used, and aluminum foil can be used conveniently especially. The thickness of the metal foil is not particularly limited, but is usually about 0.1 to 1 mm. If it is too thick, the flexibility at the time of winding the product heater is lowered. Two or three or more metal foils can be used in layers. In addition, the metal foil can be reinforced with a laminated structure with a heat-resistant film, if necessary, to prevent tearing. In this case, the heat-resistant film is preferably as thin as possible from the viewpoint of heat conduction. .

  In the present invention, one or more temperature detecting thermocouple probes can be provided between the belt-like base material layer or the soaking material layer and the enveloping material layer on the heating surface side. The thermocouple probe for temperature detection is not particularly limited, but a thermocouple can be used practically in general. In this case, when forming the encapsulating layer or sealing the lead-out port, the lead wire of the thermocouple is pulled out from the lead-out port. And it is desirable to provide the terminal which can be connected with a temperature control apparatus at the front-end | tip of a lead wire.

  In the present invention, one or more bimetal temperature switches can be disposed between the belt-like base material layer or the soaking material layer and the heating surface side encapsulating material layer. In the present invention, from the viewpoint of safety and prevention of overheating, a thermal fuse can be incorporated in the electric heater wire. At this time, the bimetal switch is set to open and close at a temperature to be controlled in advance. The bimetal switch and the thermal fuse are coupled in series to a power supply line that supplies power to the heating element. It is preferable that the tip of the power supply line has a male or female insertion plug shape that can be easily connected to a power source such as an outlet and a table tap and a controller.

  The encapsulating material is a material that encapsulates the entire band-shaped substrate, heating element, sheet-shaped heat-uniforming material, temperature detection thermocouple probe, and the like. There is also an effect of preventing the dust that is generated in a small amount due to bending or the like. As such an encapsulating material, a heat-resistant resin sheet is suitably exemplified as a material that is heat-resistant and flexible and does not generate dust due to bending or friction, and specifically includes a silicone resin film, a fluororesin film, and the like. However, PTFE resin sheets or PFA resin sheets are more preferably used from the viewpoint of less dust generation. And from a viewpoint of the adhesiveness to a to-be-heated material, a microporous PTFE resin sheet is used more suitably.

  The thickness of the above heat-resistant resin sheet is usually about 0.5 to 1 mm, and two or more of these substrates can be used as needed. Further, the width and length are appropriately determined to dimensions that can encapsulate the entire belt-like substrate, heating element, sheet-shaped soaking material, and temperature detection thermocouple probe.

  When encapsulating the heat generating layer, a lead outlet through which a part of the encapsulating material passes a lead wire such as a power supply line for supplying electricity to a heat generating element contained therein or a lead wire of a thermocouple Is provided. The number of such outlets is not particularly limited, but one place is usually sufficient, but two or more places may be formed if necessary. And the position to be formed is not particularly limited, but the tip in the length direction is convenient. However, it may be both side edges in the width direction, and may be an encapsulated surface other than the heat-sealed portion if necessary.

  In addition, when there are two outlets, the outlet of one power supply line has a plug shape and the other end has a female plug shape, and two or more piping heaters of the present invention are connected to a series. You can also

  The method of encapsulating the heat generating layer with the heat-resistant resin sheet, which is the encapsulating material, can be bonded by heat fusion if the material is heat-fusible, but is not heat-fusible. In the case of a raw material, it can be encapsulated by encapsulating it by heat-sealing with a heat-adhesive resin layer intervening in advance. A heat sealer or a heat press can be used for such heat fusion.

  In the case of the above-mentioned encapsulation, it is preferable to add a reinforcing means so that the lead-out port fixes the lead-out wire and does not easily break it, and prevents discharge of air containing dust. It is preferable to be sealed so that A known structure can be applied as the reinforcing means. The above-mentioned sealing may be performed by thermal fusion of the upper and lower sheets of the enveloping layer, but a curable sealing material is filled between the upper and lower sheets so as to wrap the power supply line and the thermocouple lead wire. It can also be performed by post-curing. Examples of such a sealing material include PFA, silicone rubber, epoxy resin, urethane resin, etc. Among them, PFA is more preferably used from the viewpoint of not generating dust after curing.

  The heat insulating portion layer is formed by encapsulating a belt-like heat insulating material layer with a heat resistant enveloping material. The heat insulating material is made of a material having excellent heat resistance and flexibility in addition to heat insulating properties. Examples of substances constituting such a heat insulating material include fluororesins such as PTFE, PFT, FEP, PCTFE, ETFE, ECTFE, and PVdF, aramid resin, polyamide, polyimide, polycarbonate, polyacetal, polybutylene terephthalate, modified polyphenylene ether, polyphenylene Examples include heat-resistant organic materials such as sulfide, polysulfone, polyethersulfone, polyarylate, and polyetheretherketone, and fiber fabrics or nonwoven fabrics, blankets, and mats made of inorganic materials such as glass, ceramic, silica, alumina, and mullite. Depending on the intended heat retention or heating temperature, it is appropriately selected and used. Moreover, the said material may be mixed and used. Such a heat insulating material can be used by stacking two or more relatively thin materials. When using two or more sheets of the same material or different materials, it is preferable that the layers are partially bonded to each other.

  The encapsulating material used for encapsulating the heat insulating layer can be appropriately selected from the encapsulating materials used for the heat generating layer. In addition, the method of encapsulating the heat insulating material with the heat-resistant resin sheet, which is the encapsulating material, is the same as in the case of the heat generating part layer described above. In the case of a material that does not have heat-fusibility, the material can be encapsulated by adhering by heat-sealing with a heat-adhesive resin layer interposed in advance. A heat sealer or a heat press can be used for such heat fusion.

  In the pipe heater of the present invention, the heat insulating layer is overlapped with both side edges in the width direction aligned so as to be on the non-heated surface side of the heat generating layer, and both side edges in the width direction are integrally coupled. It becomes. At that time, the width of both layers is usually such that when the heating surface of the heat generating portion layer of the above-mentioned piping heater is wound so as to be in close contact with the surface of the piping, the inner surface of the heat insulating portion layer is loose on the outer peripheral surface of the heat generating portion layer. Although the width of the heat generating part layer is wound so that the heating surface of the above-described heater heating part layer for piping is in close contact with the surface of the pipe, both side edges in the width direction are substantially It is desirable that the degree of matching. The widths of the heat generating part layer and the heat insulating part layer increase as the thickness of the heat generating part layer and the heat insulating part layer increase.

  The method of joining both side edges of the heat generating part layer and the heat insulating part layer is not particularly limited.For example, a method of sewing both side edges in the width direction with a sewing machine in a state in which the both side edges are aligned, When the encapsulating material is a heat-fusible material, it is a heat-sealed material. And bonding by heat bonding. A heat sealer or a heat press can be used for such heat fusion.

  The pipe heater formed by the above method can be used by being wrapped around the pipe outer peripheral surface as it is and fixed by an appropriate bundling member from the outside. In the present invention, for example, a T-shaped heater is further used. Piping branching holes suitable for heating or keeping the branching part can be provided. For example, a part of both side edges that are substantially abutting formed when a pipe heater is wound around a tubular body to be heated in the width direction is cut out, and the branch pipe penetrates through both cutouts. The above object can be achieved by forming a notch hole as much as possible. Pipe heaters with such cutouts should be shortened to provide heat and insulation only around the branch, and only pipe heaters with no cutouts should be used in areas where there are no branches. Is practical.

  The diameter of the notch hole is usually a size corresponding to the thickness of the pipe planned for the pipe heater, but it corresponds to a pipe having a larger or thinner branch pipe. It can also be a dimension. When forming the above-mentioned notch hole, the edge part which forms the hole can be sealed by thermal fusion like other edge parts in the width direction.

  The heater for piping of the present invention can be used by winding the main part as it is on the outer peripheral surface of the pipe as described above and fixing it with an appropriate binding member from the outside. A fastening portion can be provided between one edge portion in the width direction of the heater and the opposite edge portion.

  The configuration of the fastening portion is not particularly limited. For example, a band-like piece extending from one edge portion in the width direction of the pipe heater in the entire width or a part of the width is attached, and the pipe heater is used. When the strip is wound around a pipe to be heated so that the strip is on the outside, one of the coupling elements is provided at each of the strip and the position where the strip contacts the outer peripheral surface of the opposite edge of the heater. In addition, there is one that is coupled by one of the above-described coupling elements and the other of the coupling elements and fastens the piping heater.

  The band-shaped piece may be formed continuously over the entire length of the edge of the pipe heater, but may be divided into several parts and formed as a plurality of band-shaped pieces. And when the notch hole part of the butted part formed when the pipe heater is tightly wound around the pipe in the width direction as described above, it corresponds to the notch hole part or the branch pipe diameter. It is preferable that the strip corresponding to the width is removed.

  The coupling element is not particularly limited. For example, an adhesive material, a magnet, a knot, a hook, a magnet hook, an open snap, a button hook structure, a magic tape (trade name), a Velcro fastener (trade name), and a slide fastener. Etc. In the case of a knot, a button-hanging structure, a slide fastener, etc., one element and the other element can be directly provided on both side edges in the width direction of the piping heater without providing the above-mentioned band-like piece. Moreover, when using a slide fastener as a coupling element, it is preferable to join directly to the both edge parts of the said width direction, without providing a strip | belt-shaped piece. In this case, in the case where the notch for piping is provided, in order to avoid the hole, it is preferable to couple separately from both ends of the edge portion toward the notch.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples.

[Example 1]
This embodiment is an example in which a pipe heater is prepared assuming that the outer diameter of the pipe is 35 mm, and will be described with reference to FIGS.
A glass fiber tape 11 made of a glass fiber nonwoven fabric having an average diameter of 3 μm and having a thickness of 1.5 mm, a width of 110 mm, and a length of 200 mm was used as the belt-like substrate layer 11. A branch pipe hole 32 having a diameter of 35 mm is formed at the upper and lower central portions (positions 10 cm from the upper and lower ends) of both side edges in the width direction of the tape 11 when both side edges in the width direction are butted. The semicircular cutouts 32 each having a diameter of 41 mm were provided.

Then, a 100 watt nichrome wire (NCH-2, manufactured by Nippon Metal Industry Co., Ltd.) 12 covered with a silica sleeve as a heating element is formed on the surface on the heating surface side of the pipe heater 10 after the completion. The surface of the belt-like substrate 12 is arranged by being meandered four times so as to be parallel to the length direction of the electrode 11 and at substantially equal intervals in the width direction, and using the glass yarn 18 for every 5 cm of the length of the nichrome wire 12. The nichrome wire 12 was fixed by winding and sewing. Both ends of the nichrome wire 12 were connected to an insulation-coated external power supply line 17 in which a male plug was set.

  The entire belt-like base material layer 11 on which the above-mentioned nichrome wire 12 is arranged and fixed is encapsulated with a soaking material 13 in which 50 μm thick aluminum foil is doubled so that only 17 parts of the above power line protrudes outside. An encapsulant was obtained. The aluminum foil portion 13 that hits the semicircular cutout portions 32 on both edge portions of the belt-like base material was pushed in according to the cutout shape.

  Two microporous PTFE films 15 (trade name: Softmeal, manufactured by Nichias Co., Ltd.) having a thickness of 0.1 mm, a width of 116 mm, and a length of 206 mm are prepared as the encapsulating material 15, and both sides of the belt-like substrate 11 are prepared. After the semicircle 32 having a diameter of 35 mm is cut out at a position corresponding to the semicircle cutout portion 32 at the edge, and the two microporous PTFE films 15 are overlapped with each other, the envelopment made of the above-mentioned soaking material is used. Are arranged so that all of the surrounding portions including the notches 32 (hereinafter referred to as “joining”) 35 have a width of 3 mm, and the two microporous PTFEs described above are further disposed. Of the film 15, the K thermoelectrical of φ0.32 mm is provided at three points at the center of the image portion that equally divides the central line on the inner surface side of the microporous PTFE film 15 on the heating surface side of the pipe heater 10. Twin An inner surface of the microporous PTFE film 15 which is disposed on the heating surface so that the tip of the insulated lead wires (not shown) is arranged in line with the lead-out port 16 of the nichrome wire 12 is disposed. The lead wire was wound around the glass yarn 18 at a position of every 10 cm in length and fixed to the inner surface side of the microporous PTFE film 15.

  And the microporous PTFE film 15 which becomes said non-heating surface side, the strip | belt-shaped base material encapsulation body covered with the aluminum foil 13, and the heating surface side microporous PTFE film 15 which fixed the thermocouple 14 to the inner surface side. Are placed in such a way that a marginal margin part 35 of 3 mm around is generated, and then pressed using a heat sealer heated to 360 ° C. with a PFA resin narrow sheet interposed in the marginal part 35. Thus, a heat generating layer in which the power line 17 and the lead wire (not shown) were drawn out from the outlet 16 was obtained. The total thickness was about 3 mm.

  In addition, as the heat insulating material 21 of the heat insulating portion layer, two mats 21 made of glass fiber having a thickness of 3 mm, a width of 110 mm, and a length of 200 mm are used in an overlapping manner, and these two mats are made of glass fiber yarns. The two sheets were sewn loosely at lattice points with an interval of 5 cm. And the notch part 32 was similarly provided in the both-sides edge part of the width direction corresponding to the semicircle notch part 32 of the said strip | belt-shaped base material 11 so that the semicircle hollow of 41 mm in diameter might be made.

  Prepare two sheets of PTFE resin-coated glass cloth 22 (trade name: GF3-5, manufactured by Kanibo Plus Co., Ltd.) having a thickness of 0.1 μm, a width of 170 mm, and a length of 210 mm as the encapsulating material 22 for the heat insulating part, and the left end The above heat insulating material 21 is arranged from the 3 mm position to the center side, a semicircle having a diameter of 35 mm is cut out 32 at a position corresponding to the semicircular cutout portion 32 at the right end of the heat insulating material 21, and the right semicircle cutout is provided. All the strips 37 on the right side of the part 32 were excised.

  The above-mentioned glass fiber mat 21 is sandwiched between two PTFE resin-coated glass cloths 22 treated as described above, and a 3 mm joining margin 35 can be secured around the glass fiber mat 21 including the joining margin at the left end. The portion including the heat insulating material 21 is arranged by pressing and heat-sealing using a heat sealer heated to 360 ° C. with a 3 mm wide PFA resin thin sheet interposed in the joining margin. The heat insulation part which has the semicircle notch part 32 in the both edges of the width direction of this was obtained. The total thickness was about 7 mm. The heat insulating portion and the heat generating portion were integrated by aligning joining margins 35 and 36 at both side edges in the width direction and sewing them at the joining margin portions 35 and 36, respectively. The two belt-like portions composed only of the glass cloth 31 on the right side of the heat insulating portion were combined into a single layer by sewing the periphery to form a sealing portion belt-like piece.

  One element 33 of the magic tape having a width of 10 mm and a length of 80 mm was joined along the edge portion of the front end portion of the sealing portion belt-like piece 31 by using an adhesive, whereby the heater 10 for piping was obtained. When this pipe heater 10 was wound in the width direction so that the heating surface faces the pipe outer periphery having a diameter of 35 mm, the inner surface of the heat insulating portion layer was in close contact with the outer peripheral surface of the heat generating portion layer. There were no wrinkles and it was in close contact. Then, the other element 34 of the above-mentioned magic tape is bonded to the position facing the outer peripheral part of the pipe heater 10 around which the one element 33 of the magic tape joined to the tip of the above-mentioned sealing portion strip 31 is wound. When the two elements 33 and 34 were pressed and sealed together, the pipe heater 10 was mounted on the outer peripheral surface of the pipe perfectly and stably.

[Example 2]
Example 1 is the same as Example 1 except that the belt-like base material 11 of the heat generating part layer and the semicircular cutouts 32 on both sides of the encapsulating material 15 are not provided and both sides are made straight. Thus, a heating part layer was produced. Similarly, there are no cutouts 32 on both sides of the heat insulating material 21 of the heat insulating part layer, and the cutouts 32 and the strips 31 of the band-like pieces 31 are located at positions corresponding to the cutouts 32 of the encapsulating material 22. A heat insulating layer is produced in the same manner as in Example 1 except that there is no notch 32 and the velcro (33, 34) sewn to the outer peripheral surface side and the tip of the strip is connected in series. did. The obtained heat generating part layer and heat insulating part layer were sewn and integrated at the left and right heat-sealed parts in the same manner as in Example 1, and the heat generating part layer and the heat insulating part layer were formed into a main body part to form a branch pipe hole 32. A piping heater 10 having no air gap was obtained.

[Example 3]
A pipe portion having an outer diameter of 35 mm, a length of 100 cm, and a T-shaped branch at a position 30 cm from the end was subjected to heat insulation using the pipe heater 10 obtained in Example 1 and Example 2. Wrap one pipe heater 10 having a branch pipe hole obtained in Example 1 in a part having a T-shaped branch in the above pipe part so that the branch pipe position and the notch hole part of the branch pipe are aligned. Then, one element 33 on the inner side of the magic tape of the sealing strip 31 is overlapped and bonded to the other element 34 of the outer peripheral surface of the magic tape, and the remaining length of the pipe is 10 cm and 30 cm. Four pipe heaters 10 having no branch pipe holes obtained in Example 2 were wound, and similarly, one element 33 of the magic tape inside the sealing strip 31 was overlapped with the other elements 34 on the outer peripheral surface. It was bonded and fixed, and the entire surface of the target piping part was covered.

  The power supply line 17 of the heaters for both pipes and the lead wires of the thermocouple 14 are respectively connected to a temperature control device (not shown), and the temperature control device sets the control temperature to 150 ° C. And kept warm. As for the wound appearance, although the total thickness of the heater 10 for pipes was 10 mm or more, the inner surface of the heat generating portion layer was in close contact with the outer peripheral surface of the pipe without generation of wrinkles.

  The heater for piping of the present invention generates extremely little dust and emitted gas while maintaining flexibility, and can be tightly wound on the surface of the piping without being wrinkled on the heating portion layer, thereby covering the heating portion. The heating energy generated in the layer is efficiently transferred to the piping and energy efficiency is high, and since there is no heat storage due to poor heat conduction in the heat generating part layer, it is not overheated locally, so there is little failure and durable The property is excellent. Further, by providing the fastening portion, it is easy to attach and detach to / from piping such as precision instruments and devices. Therefore, it can be used efficiently and stably even in piping in a clean room where a high level of quality is required.

External appearance explanatory drawing of the heater for piping of Example 1 Cross-sectional structure explanatory drawing of the heat generating part of the heater for piping of Example 1 Planar structure explanatory drawing of the heater for piping of Example 1.

Explanation of symbols

10 Heater for piping 11 Strip-like base material layer 12 Heating element (Nichrome wire)
13 Soaking material layer (good heat conductive material)
14 Thermocouple 15 Heating Portion Encapsulating Material Layer 16 Drawer Port 17 Electric Power Supply Line 18 Heating Element (Nichrome Wire) Sewing Thread 20 Pipe Heater Heating Portion Cross Section 21 Heat Insulating Material Layer 22 Heat Insulating Portion Encapsulating Material Layer 23 Heat Insulating Portion Outer Surface (band-shaped substrate, heat insulating material)
30 Piping heater plan view 31 Sealing part strip 32 Notch 33 One of the sealing part coupling elements 34 The other 35 of the sealing part coupling elements (heat generation part / heat insulation part encapsulating material layer)
36 Integrated coupling part 37 Sealing part belt-like notch part

Claims (7)

  A heater for a pipe having a heat generating part layer and a heat insulating part layer, which is wound around the outer periphery of the pipe to be heated in the width direction to heat and keep the pipe, and the heat generating part layer and the heat insulating part layer are separated from each other. The heating part layer is formed by arranging a heating element on the heating surface side of the heat-resistant and flexible belt-like base material and encapsulating the whole with a heat-resistant enveloping material, and The above heat insulating part layer is formed by encapsulating a belt-like heat insulating material with a heat resistant enveloping material, and the heat insulating part layer is arranged on the non-heated surface side of the heat generating part layer, and the both edges in the width direction are aligned. Overlap, and the overlapped edge portions are integrally joined to form a main body portion, and at that time, when the heating surface of the above-described piping heater heating portion layer is wound so as to be in close contact with the surface of the piping, the heat insulating portion layer The width of the heat insulation part layer is long enough that the inner surface of the heat insulating part layer is loosely adhered to the outer peripheral surface of the heat generating part layer. Pipe heater, characterized in that it is a constant.   The width of the heat generating part layer is such a length that both side edges in the width direction of the main body are substantially abutted when wound so that the heating surface of the heater for heat generating pipe layer is in close contact with the surface of the pipe. The heater for piping according to claim 1, wherein:   A part of both side edges in the width direction of the main body part which are substantially abutted is cut out, and a notch hole is formed so as to allow the branch pipe to pass through both the notch parts. The heater for piping as described.   The piping heater according to any one of claims 1 to 3, further comprising a fastening portion between one side edge portion in the width direction of the pipe heater and the opposite side edge portion thereof. .   As the fastening portion, a strip-like piece extending from one edge portion in the width direction of the main body portion of the pipe heater to the full width or a part of the width thereof is attached, and the pipe heater is arranged so that the strip piece is outside. When wound around the pipe to be heated, the strip-shaped piece tip and the strip-shaped piece are provided with one and the other part of the coupling element at a position where the strip-shaped piece comes into contact with the outer peripheral surface of the opposite edge of the heater, respectively. The heater for piping according to claim 4 characterized by things.   5. A strip-like piece is removed with a width corresponding to a notch hole portion of a butt portion or a branch pipe diameter formed when a pipe heater is wound in close contact with the pipe in the width direction. The heater for piping as described in 4. The pipe according to any one of claims 1 to 6, wherein a sheet-shaped soaking material layer is provided at least between the heating element of the heating part layer and the heating surface side encapsulating material layer. Heater.

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